​In her music, Emmanuelle Da Costa gives an essential role to the micro and macroscopic evolution of sound matter and its influence on overall form. She explores a wide range of dynamics and instrumental techniques, from saturation to almost imperceptible shudders of sound. She collaborates with various ensembles, festivals and institutions: the Ensemble Orchestral Contemporain, the Ensemble intercontemporain, Icarus vs Muzak, the Maîtrise de Radio France, Canticum Novum, the Présence Compositrices festival, the Choeur et Orchestre des Jeunes - l'Orchestre des Champs-Élysées, the Espace culturel de Chaillol, the Superspectives festival, European Patent Office, Mômeludies... Also trained as a choral conductor, she places particular emphasis on choral singing in her creative work. She has received commissions from the Maîtrise de Radio France, the Maîtrise de la Loire, the Maîtrise de Toulouse, the Institut Français d'Art Choral, the choirs Syllepse, Dulci Jubilo, Artmilles, Festyvocal, Voices 21C...

For the years 2024-2025, she is composer-in-residence with the Ensemble Orchestral Contemporain conducted by Bruno Mantovani. This residency will give rise to two creations for large ensemble: Les Dentelles du Cygne (May 24) and World Lines (co-commission: Les Dentelles du Cygne (May 24) and World Lines (co-commission Grame CNCM, February 25). She also composes two pocket operas for children's voices. Le Château des Carpathes (libretto by Henri Dalem, commissioned by the Maîtrise de la Loire), which in 2022 was awarded a grant from the French Ministry of Culture for the writing of an original musical work. And Actéon ou le triomphe de la vacuité, created in November 2024 for the Maîtrise de Radio France on a libretto by Samuel Muller, conducted by Morgan Jourdain and directed by Victoria Sitjà at the Amphithéâtre Olivier Messiaen of the Opéra Bastille (co-production Radio France / Académie de l'Opéra national de Paris). She is also interested in the performing arts, and enjoys encounters with other creators: writers, performers, actors, visual artists, dancers...

She collaborates regularly with Compagnie Danceflore and performer/dancer Julie Debellis (shows #REINES, or Résonance avec le Vivant). In 2023, she created Ariane, convocations with Danceflore Cie and Compagnie Nomade, based on a play written by Juliette Bargès (artistic residency at Le Magasin / Chok Théâtre). In 2021-22, she won the Mécénat Musical Société Générale with the show Minotaure (Pierre- Louis Besson, performance painting / Lisa Heute, composition and accordion / Léa Cointet, cello). Emmanuelle also composes for the image and collaborates notably with video artists Léa Ducos (Olympiades - FID Marseille and FIAC 2015 selection, Without Pictures and Conversation? - FID Marseille 2016, Wuhan Design Biennale China) and Élise Meunier (Étude numéro un, Frac PACA 2017).

She studied instrumental and vocal composition with Pascale Jakubowski at the Saint-Étienne Conservatoire, electroacoustic composition with Diego Losa, and choral conducting with Maëlle Defoin-Gaudet, and obtained a DEM in all three disciplines. She also holds a Master's degree in musicology from the Université Jean Monnet in Saint-Étienne. She went on to study composition at the CNSMD in Lyon with David Chappuis and Luca Antignani, where she obtained a Master's degree in musical creation. Her compositional thinking also developed thanks to the masterclasses and academies she attended along the way, with Stefano Gervasoni, Florentine Mulsant, Francesco Filidei, Xu yi, Robert Piéchaud, Guillaume Connesson and others...

The transmission of contemporary music and teaching are important aspects of her work. She holds a Certificat d'Aptitude in instrumental and vocal composition, and is involved in a variety of activities: teaching musical creation until June 2022 at the Maîtrise de la Loire, workshops in elementary school and at the Conservatoire de Roanne as part of the Le Son des Mômes project, “La Maîtrise enchante les bébés” at the Pouponnière du Département de la Loire, improvisation workshops at the Festival Présence Compositrices, and residencies with the Ensemble Orchestral Contemporain at the CRR Massenet in Saint-Étienne. In 2024, she is also a professor of contemporary music history at the Université Jean Monnet.